Electrostatic RF MEMS switches
First Claim
1. A micro switch, comprising:
- a substrate;
a dielectric layer formed on the substrate, the dielectric layer having a movement region formed of a predetermined portion of the dielectric layer that is capable of moving up and down by a hinge part formed on one side of the movement region;
a conductive layer formed on a predetermined portion of the movement region;
first and second electric conductors formed a predetermined distance above the conductive layer;
a piezoelectric layer formed on the movement region, causing the conductive layer to move upwards by the supply of a predetermined voltage, and resistively coupled with the first and second electric conductors to allow a current signal to flow between the first and second electric conductors; and
a dielectric film formed on the conductive layer.
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Accused Products
Abstract
A micro switch having a dielectric layer having a movement region formed on a substrate, a conductive layer formed on a predetermined portion of the movement region, a dielectric film formed on the conductive layer, first and second electric conductors formed a predetermined distance above the dielectric film, one or two lower electrodes formed on the movement region, and one or two upper electrodes formed a predetermined distance above the two lower electrodes, the one or two upper electrodes moving the conductive layer and the dielectric film upwards when an electrostatic force occurs between the upper and lower electrodes, and capacitively coupled with the first and second electric conductors to allow a current to flow between the first and second electric conductors. Such a micro switch has a high on/off ratio and isolation degree and a simple structure, and can be fabricated in a very easy process.
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Citations
13 Claims
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1. A micro switch, comprising:
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a substrate; a dielectric layer formed on the substrate, the dielectric layer having a movement region formed of a predetermined portion of the dielectric layer that is capable of moving up and down by a hinge part formed on one side of the movement region; a conductive layer formed on a predetermined portion of the movement region; first and second electric conductors formed a predetermined distance above the conductive layer; a piezoelectric layer formed on the movement region, causing the conductive layer to move upwards by the supply of a predetermined voltage, and resistively coupled with the first and second electric conductors to allow a current signal to flow between the first and second electric conductors; and a dielectric film formed on the conductive layer. - View Dependent Claims (2, 3, 4, 5)
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6. A micro switch, comprising:
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a substrate; a dielectric layer formed on the substrate, the dielectric layer having a movement region formed of a predetermined portion of the dielectric layer that is capable of moving up and down by a hinge part formed on one side of the movement region; a conductive layer formed on a predetermined first portion of the movement region; first and second electric conductors formed a predetermined distance above the conductive layer; and a piezoelectric layer formed on a second portion of the movement region, causing the conductive layer to move upwards by the supply of a predetermined voltage, and resistively coupled with the first and second electric conductors to allow a current signal to flow between the first and second electric conductors, wherein the second portion of the movement region corresponds to a portion of the movement region other than the predetermined first portion of the movement region. - View Dependent Claims (7, 8, 9, 10)
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11. A micro switch, comprising:
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a substrate having a recessed portion; a dielectric layer formed on the substrate, the dielectric layer having a protruding movement region that protrudes from a non-movement region of the dielectric layer, the protruding movement region being connected to the non-movement region via a pivoting means provided between the non-movement region and the protruding movement region of the dielectric layer, the protruding movement region protruding from the non-movement region and extending over the recessed portion of the substrate such that the protruding movement region is free to pivot about the pivoting means; a conductive layer formed on a predetermined portion of the protruding movement region; first and second electric conductors formed a predetermined distance above the conductive layer; and a piezoelectric layer formed on the protruding movement region, causing the conductive layer to move upwards by the supply of a predetermined voltage, and resistively coupled with the first and second electric conductors to allow a current signal to flow between the first and second electric conductors. - View Dependent Claims (12, 13)
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Specification